We are taking our two grandchildren aged 11 and 13 to Disney World. On some days I will be taking them alone. The eldest is very keen to go on the scariest and wildest of rides during which I intend to accompany her, but only if I can find someone to stay with the 11 year old (who is not so keen) during the ride. How do I locate a guide or responsible person to stay with my youngest granddaughter while I enjoy a wild ride with my eldest granddaughter? Thanks in advance for any help with this.